Why would you refuse Pfizer? It’s supposed to be the best one and is the only vaccine that people 16 years and above are approved to receive here in the states. That says to me, it’s the safest vaccine or at least more tested.
The Astra-Zeneca one, as I understand it, is the one that might be causing blood clots and the one that several countries are refusing to give at this point in time. Although I think it may be a certain batch of Astra Zeneca.
The Astra Zeneca is not in the USA yet. I would have liked to the Johnson vaccine, only one shot but I got the Pfizer. Had to take what they had, and so glad I am fully vaccinated